Paleomagnetism is the study of the record of the Earth’s magnetic field preserved in rocks, sediments, and archaeological materials. This field of study is important for understanding plate tectonics, the movement of continents, and the history of the Earth’s magnetic field, including geomagnetic reversals.
Reference: Butler, R. F. (1992). “Paleomagnetism: Magnetic Domains to Geologic Terranes.” Blackwell Science.